Thanks Steve, but that's just it: the exact spot of the crash keeps changing, so I can't tell what spot may causing the freeze. It's frozen from 46% to around 51%, which are two very different parts. The half of the video that doesn't get rendered has quite a few special effects, but that's never been a problem for me before (cutting them out isn't an option, as they're vital to the final product). I've tried rendering the second half by itself and tried different video outputs, but none of that has worked.